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Finding the Fourth Proportional to 328, 489.80 and 267

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Solution

The fourth proportional to 328, 489.80 and 267 is: 398.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    328 : 489.80 = 267 : x
  2. Step 2: Convert to fraction form
    328/489.80 = 267/x
  3. Step 3: Cross multiply
    328x = 489.80 × 267
  4. Step 4: Simplify right side
    328x = 130,776.60
  5. Step 5: Solve for x
    x = 130,776.60/328
  6. Step 6: Final answer
    x = 398.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.